pitzgibbons



. uwrm .STLATES PATENT 'rnronc BATRIGK FIT-ZGIBBONS; OFOSWEGO, NEW YORK, ASSIGNOR" OF ONE-HALF HIS. RIGHT TO RALPH STONE, OF SAME PLACE.

Specification forming part of Letters Patent N03 189;!130; datedApril 241 1877 application filed February 1 21, 1877.

To dill tvhom'tt may'concem:

Beit known that BPArR'roKFIrzGrBBoNs,

State of NewYorkfhaveinventeda new and useful Improvement in'Steanr Boilers,ofwhich thefollowing, taken in connection with the accompanying drawings, is a run, clear, and e actdescription i Thisinvention relatesto that classofsteam boilers which are composed of a cylindrical shell, constituting the boiler proper, a firebox" underneath thesame, a smoke-box or combustion-chamber at the rear-end, in direct communication with thefire-box, anda smokebox with the exit on smoke-stack in front'com municatingwith the rear smoke-box through flues within the boiler proper, and having a water-space around therespectiveparts.

The invention consists,"first, in anovel construction of the throat and back smoke-box connected therewith, whereby the products of combustion are more uniformly distributed around the bottom of the boiler proper and in their passage through the lines; also better access to the smoke-box for repairs is obtained, and to the bottom of the smoke-box a stronger form is given for water-space under it, and

the removal of accumulated soot and ashes in V the smoke-box facilitated; second, in an improved method and means of attaching the back flue-sheet to the shell of the boiler proper and its contiguous parts, whereby the said fluesheet is rigidly secured to the bottom of the boiler proper and to the inside sheet of the water-leg, and which also braces the said sheet at the throat of the fire-box; third, in a novel and ingenious method of joining the back smoke-box with the flue-sheet and throatsheet, whereby two easily-accessible calkingedges around the entire joint are obtained, and the attachment of the smoke-box greatly facilitated, all constructed substantially in the manner hereinafter fully described, for the purposes specified.

In the accompanying drawings, Figure 1 is a side view of a boiler constructed on my improved plan, with portions removed to show some of the essential features of same. Fig. 2 is a longitudinal section of same; Fig. 3, a rear end view with half of the end plate removedto show more i'ullythe formotixthe rear 7 smoke-100xand thewate-r-space surrounding of Oswego, in the county of Oswego, in theit. Figmtis atransverse?section taken-won line :20 a: inwFig.21; and Fig.6 par-tlywar front view of the boilerand'j partlyza' transverse section on line=y=y in Fig: 1.

Similar letters of reference indicatetcorrespondin'g parts.

E is the boiler proper, cylindric:inbform, and having the smoke-box As at the frontend and the smoke-box A' at the rear e'nd conn munic'atingwitheach otheriithrough flues in the boiler. O is the fire-boxycommunicating with the rear smoke-box throughthe throat D. "a' is the water-spaceyor soecalled waterlegyat the sideof the fire-box.

The second part of my invention pertains-to the throat D i and- -rear smoke-box 1A ,a the former-ofwhich remade withl therviewrzto better distributing the products of combustion in their passage, and cause the same to impinge upon all parts of the bottom of the boiler proper with uniform intensity, and also to allow free access to the smoke-box for cleaning and repairs. It is made in the shape of an inverted arch, formed by the bottom of the boiler proper at the top, the curved upper ends a of the water-leg a at the sides, and a segmental or crescent-shaped upper end ofthe throat-sheet at at the bottom. The smokebox A, having its bottom curved correspondingly to fit the segmental top of the throatsheet d, is thus strengthened to better resist the pressure in a water-space underneath it, and the soot and ashes which, in cleaning the flues and otherwise, accumulates in the smokebox, are caused to fall toward the center, and are easily removed therefrom through the throat D.

The back flue-sheet f is extended injwidth to bring its side edges to coincide with the sides of the throat, and is rigidly secured to the bottom of the shell of the boiler proper, and to the arched top portion a of the waterleg at, by means of an angle-iron or L-shaped band, 8, spanning across the bottom portion of the boiler-shell, and over the arched top portion a of the water-leg and riveted thereto,

to which band the flue-sheet is riveted. The band 6, besides holding the flue-sheet f, also braces the inner sheet of the water-leg. at the throat. The fluesheet is provided with a rearward-projecting flange, 4, around the top and sides, coinciding with a rearward-projecting flange, r, on the throat-sheet, and form ing with it one continuous flange for the attachment of the smoke-box.

For the purpose of rendering the rivets and calking edges easy of access, the top and sides of the smoke-box are applied to the outside of the flange on the flue-sheet, and the semicircular bottom portion of the smoke-box is fitted to the inside of the flange on the throat-sheet, thus forming two calking-edges all around easy of access from the interior of the smokebox through the man-hole in the top of the boiler proper, and from the fire-box.

Having formed one. substantial side of a water-space, 8, under the smoke-box by the semicircular bottom of same, I complete the said water-space by likewise giving the bottom portion of the end plate 19 of the exterior shell of the boiler a semicircular form and vertically elongating the said plate, so as to bring its bottom portion a few inches below the bottom of the smoke-box and concentric therewith, thus forming under the smoke-box a water-space of great strength, and which collects the sediments of the water in one place, where readily-removed and least liable to do injury.

Having thus described my improvements, what I claim as new, and desire to secure by Letters Patent, is

1. The throat D, having the shape of an inverted arch, formed by the bottom portion of the shell of the boiler proper at the top, the curved top portion a. of the water-leg a at the sides, and a segmental or crescent-shaped top of the throat-sheet d at the bottom, and the rear smoke-box A, having a correspondingly curved bottom, all constructed and combined substantially in the manner specified, for the purposes set forth.

2. The back flue-sheet f, extended in width to cause its side edges to coincide with the sides of the throat D, and attached to the bottom portion of the shell of the boiler proper and to the curved top portion a of the waterleg at, by means of the angle iron or L-shaped band 0, extended across the bottom portion of the boiler-shell, and over the curved top portion a of the water-leg, substantially as described and shown, for the purpose specified.

3. The flue-sheet and the throat-sheet 01,

having the rearward-projecting flange r forming one continuous flange, and the smoke-box A attached with its top and sides to the ex terior of the flange on the flue-sheet, and with its semicircularbottom to the interior of the flange on the throat-sheet, substantially in the manner and for the purpose shown and described.

In testimony whereof I have signed my name and afflxed my seal in the presence of two attesting witnesses at Oswego, in the county of Oswego and State of New York, this 13th day of February, 1877.

PATRICK FITZGIBBONS.

Witnesses:

JOHN J. WHITE, FRANK WILLIAMS. 

